package com.heima.wemedia.service.impl;

import com.alibaba.fastjson.JSONArray;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.heima.common.constants.message.NewsAutoScanConstants;
import com.heima.common.constants.message.NewsUpOrDownConstants;
import com.heima.common.constants.message.PublishArticleConstants;
import com.heima.common.constants.wemedia.WemediaConstants;
import com.heima.common.exception.CustException;
import com.heima.model.common.dtos.PageResponseResult;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.threadlocal.WmThreadLocalUtils;
import com.heima.model.wemedia.dtos.NewsAuthDTO;
import com.heima.model.wemedia.dtos.WmNewsDTO;
import com.heima.model.wemedia.dtos.WmNewsPageReqDTO;
import com.heima.model.wemedia.pojos.WmNews;
import com.heima.model.wemedia.pojos.WmNewsMaterial;
import com.heima.model.wemedia.pojos.WmUser;
import com.heima.model.wemedia.vos.WmNewsVO;
import com.heima.wemedia.mapper.WmMaterialMapper;
import com.heima.wemedia.mapper.WmNewsMapper;
import com.heima.wemedia.mapper.WmNewsMaterialMapper;
import com.heima.wemedia.mapper.WmUserMapper;
import com.heima.wemedia.service.WmNewsService;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.checkerframework.checker.units.qual.C;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;


import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service
@Slf4j
public class WmNewsServiceImpl  extends ServiceImpl<WmNewsMapper, WmNews> implements WmNewsService {
    @Value("${file.oss.web-site}")
    String webSite; //前缀
    @Autowired
    WmNewsMaterialMapper wmNewsMaterialMapper;

    /**
     * 查询所有自媒体文章
     *
     * @param dto
     * @return
     */
    @Override
    public ResponseResult findList(WmNewsPageReqDTO dto) {
        //1.参数校验 ： 分页
        dto.checkParam();
        //2.构建查询结果：
        LambdaQueryWrapper<WmNews> wrapper = Wrappers.<WmNews>lambdaQuery();
        //2.1 如果有文章标题 模糊查询 title
        if (StringUtils.isNotEmpty(dto.getKeyword())) {
            wrapper.like(WmNews::getTitle, dto.getKeyword());
        }
        //2.2 如果有channelId 查询 channelId
        if (dto.getChannelId() != null) {
            wrapper.eq(WmNews::getChannelId, dto.getChannelId());
        }
        //2.3 如果有status 查询status
        if (dto.getStatus() != null) {
            wrapper.eq(WmNews::getStatus, dto.getStatus());
        }
        //2.4 如果有开始时间和结束时间  使用between 查询 publishTime 发布时间字段
        if (dto.getBeginPubDate() != null && dto.getEndPubDate() != null) {
            wrapper.between(WmNews::getPublishTime, dto.getBeginPubDate(), dto.getEndPubDate());
        }
        //2.5 获取登录用户 使用userId查询
        WmUser user = WmThreadLocalUtils.getUser();
        if (user != null) {
            wrapper.eq(WmNews::getUserId, user.getId());
        }
        //2.6 按照createTime 降序排序
        wrapper.orderByDesc(WmNews::getCreatedTime);
        // 2.7 设置分页条件
        Page<WmNews> pageReq = new Page(dto.getPage(), dto.getSize());
        //3.执行查询得到的结果  为host字段添加访问前缀webSite
        IPage<WmNews> pageResult = page(pageReq, wrapper);
        PageResponseResult pageResponseResult = new PageResponseResult(dto.getPage(), dto.getSize(), pageResult.getTotal(), pageResult.getRecords());
        pageResponseResult.setHost(webSite);
        return pageResponseResult;
    }

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Transactional
    @Override
    public ResponseResult submitNews(WmNewsDTO dto) {
        //1.校验参数 封装WmNews对象
        if (StringUtils.isBlank(dto.getContent())) {
            CustException.cust(AppHttpCodeEnum.PARAM_INVALID, "文章内容不能为空");
        }
        //校验是否登录
        WmUser user = WmThreadLocalUtils.getUser();
        if (user == null) {
            CustException.cust(AppHttpCodeEnum.NEED_LOGIN);
        }
        WmNews wmNews = new WmNews();
        BeanUtils.copyProperties(dto, wmNews);
        //type字段： 当type为-1 时 代表自动生成 暂时将type设置为null
        if (WemediaConstants.WM_NEWS_TYPE_AUTO.equals(dto.getType())) {
            wmNews.setType(null); //防止报异常
        }
        // news的封面数据库的时字符串 而dto的封面是字符换集合
        if (!CollectionUtils.isEmpty(dto.getImages())) {
            String imagesStr = imagesToString(dto.getImages());
            wmNews.setImages(imagesStr);
        }
        wmNews.setUserId(user.getId());

        //2. 保存或者修改
        saveOrUpdateNews(wmNews);
        //如果是草稿 不用保存关联关系 直接返回
        if (WemediaConstants.WM_NEWS_DRAFT_STATUS.equals(wmNews.getStatus())) {
            return ResponseResult.okResult();
        }
        //3.保存 文章 和素材的关联关系
        //3.1 抽取文章内容中所引用的图片路径集合
        List<String> contentImages = parseContentImages(dto.getContent());
        //3.2 保存内容和素材的关联关系
        if (!CollectionUtils.isEmpty(contentImages)) {
            saveRelativeInfo(contentImages, wmNews.getId(), WemediaConstants.WM_CONTENT_REFERENCE);
        }
        //3.3 保存封面和素材的关联关系
        saveRelativeInfoForCover(contentImages, wmNews, dto);
        // 发送审核信息 信息内容文章id
        rabbitTemplate.convertAndSend(NewsAutoScanConstants.WM_NEWS_AUTO_SCAN_QUEUE,wmNews.getId());
        log.info("发送待审核消息成功 消息内容：{}" ,wmNews.getId());
        return ResponseResult.okResult();
    }

    //根据id查询文章
    @Override
    public ResponseResult findWmNewsById(Integer id) {
        //1.参数校验
        if (id == null) {
            CustException.cust(AppHttpCodeEnum.PARAM_INVALID);
        }
        //2 执行查询
        WmNews wmNews = getById(id);
        if (wmNews == null) {
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        //3 返回结果
        ResponseResult result = ResponseResult.okResult(wmNews);
        result.setHost(webSite);
        return result;
    }

    @Override
    public ResponseResult delNews(Integer id) {
        //参数校验
        if (id == null) {
            CustException.cust(AppHttpCodeEnum.PARAM_INVALID, "文章Id不可缺少");
        }
            //获取数据
            WmNews wmNews = getById(id);
            if (wmNews == null) {
                CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST, "文章不存在");
            }
            //3.判断当前文章的状态  status==9  enable == 1
            if (wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode()) &&
                    wmNews.getEnable().equals(WemediaConstants.WM_NEWS_UP)) {
                CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST, "文章已发布，不能删除");
            }
            //4.去除素材与文章的关系
            wmNewsMaterialMapper.delete(Wrappers.<WmNewsMaterial>lambdaQuery()
                    .eq(WmNewsMaterial::getId, wmNews.getId()));
            //5.删除文章
            removeById(wmNews.getId());
            return ResponseResult.okResult();

    }
        //文章上下架操作
    @Override
    public ResponseResult downOrUp(WmNewsDTO dto) {
        //1.检查参数
        if (dto ==null || dto.getId()==null){
            CustException.cust(AppHttpCodeEnum.PARAM_INVALID);
        }
        Short enable = dto.getEnable();
        if (enable==null ||!WemediaConstants.WM_NEWS_UP.equals(enable)&& !WemediaConstants.WM_NEWS_DOWN.equals(enable)){
            CustException.cust(AppHttpCodeEnum.PARAM_INVALID,"上下架状态错误");
        }
        //2.查询文章
        WmNews wmNews = getById(dto.getId());
        if (wmNews==null){
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST,"文章不存在");
        }
        //3.判断文章是否发布
        if (!wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode())){
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST,"当前文章不是发布状态，不能上下架");
        }
        //4.修改文章状态，同步到app端（后期做）TODO
        update(Wrappers.<WmNews>lambdaUpdate().eq(WmNews::getId,dto.getId())
        .set(WmNews::getEnable,dto.getEnable()));
        //判断wmNews关联的articleId是否为空
        if (wmNews.getArticleId()!=null){
            // 上架
            rabbitTemplate.convertAndSend(NewsUpOrDownConstants.NEWS_UP_OR_DOWN_EXCHANGE,NewsUpOrDownConstants.NEWS_UP_ROUTE_KEY,
                    wmNews.getArticleId());
            log.info("自媒体文章上架 并成功发送上架消息到消息队列： 文章id:{}",wmNews.getArticleId());
            // 下架
        }else {
            //下架
            rabbitTemplate.convertAndSend(NewsUpOrDownConstants.NEWS_UP_OR_DOWN_EXCHANGE,NewsUpOrDownConstants.NEWS_DOWN_ROUTE_KEY,
                    wmNews.getArticleId());
            log.info("自媒体文章下架 并成功发送下架消息到消息队列： 文章id:{}",wmNews.getArticleId());
        }


        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }

    @Autowired
    WmNewsMapper wmNewsMapper;
    /**
     * 查询文章列表
     * @param dto
     * @return
     */
    @Override
    public ResponseResult findList(NewsAuthDTO dto) {
        //1.检查参数
        dto.checkParam();
        //记录当前页
        int currentPage = dto.getPage();
        //设置起始页
        dto.setPage((dto.getPage()-1)*dto.getSize());
        if(StringUtils.isNotBlank(dto.getTitle())){
            dto.setTitle("%"+dto.getTitle()+"%");
        }

        //2.分页查询
        List<WmNewsVO> wmNewsVoList = wmNewsMapper.findListAndPage(dto);
        //统计多少条数据
        long count = wmNewsMapper.findListCount(dto);

        //3.结果返回
        ResponseResult result = new PageResponseResult(currentPage, dto.getSize(), count, wmNewsVoList);
        result.setHost(webSite);
        return result;
    }
        @Autowired
    WmUserMapper wmUserMapper;
    /**
     * 查询文章详情
     * @param id
     * @return
     */
    @Override
    public ResponseResult findWmNewsVo(Integer id) {
        //1参数检查
        if(id == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        //2.查询文章信息
        WmNews wmNews = getById(id);
        if(wmNews == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        //3.查询作者
        WmUser wmUser = null;
        if(wmNews.getUserId() != null){
            wmUser = wmUserMapper.selectById(wmNews.getUserId());
        }

        //4.封装vo信息返回
        WmNewsVO wmNewsVo = new WmNewsVO();
        BeanUtils.copyProperties(wmNews,wmNewsVo);
        if(wmUser != null){
            wmNewsVo.setAuthorName(wmUser.getName());
        }
        ResponseResult responseResult = ResponseResult.okResult(wmNewsVo);
        responseResult.setHost(webSite);
        return responseResult;
    }

    /**
     * 自媒体文章人工审核
     * @param status 2  审核失败  4 审核成功
     * @param dto
     * @return
     */
    @Override
    public ResponseResult updateStatus(Short status, NewsAuthDTO dto) {

        //1.参数检查
        if(dto == null || dto.getId() == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }
        //2.查询文章
        WmNews wmNews = getById(dto.getId());
        if(wmNews == null){
            return ResponseResult.errorResult(AppHttpCodeEnum.DATA_NOT_EXIST);
        }
        // 检查文章状态 不能为9  已发布
        if (wmNews.getStatus().equals(WmNews.Status.PUBLISHED.getCode())) {
            CustException.cust(AppHttpCodeEnum.DATA_NOT_ALLOW,"文章已发布");
        }
        //3.修改文章状态
        wmNews.setStatus(status);
        if(StringUtils.isNotBlank(dto.getMsg())){
            wmNews.setReason(dto.getMsg());
        }
        updateById(wmNews);

        // TODO 通知定时发布文章
        if (status.shortValue()==WmNews.Status.ADMIN_SUCCESS.getCode()){
            long publishTime = wmNews.getPublishTime().getTime();//发布时间
            long nowTime = System.currentTimeMillis();//当前时间
            long remainTime=(publishTime-nowTime);//距离发布的时间
            rabbitTemplate.convertAndSend(PublishArticleConstants.DELAY_DIRECT_EXCHANGE,
                    PublishArticleConstants.PUBLISH_ARTICLE_ROUTE_KEY,
                    wmNews.getId()
                    , new MessagePostProcessor() {
                        @Override
                        public Message postProcessMessage(Message message) throws AmqpException {
                            //对消息做后置处理 设置消息 x-delay 延时时间
                            message.getMessageProperties().setHeader("x-delay",remainTime<=0 ? 0:remainTime);
                            return message;
                        }
                    });

        }

        return ResponseResult.okResult(AppHttpCodeEnum.SUCCESS);
    }


    /**
     * 保存封面和素材的关联关系
     * @param contentImages  内容中引用的图片路径
     * @param wmNews  文章
     * @param dto 请求参数
     */
    private void saveRelativeInfoForCover(List<String> contentImages, WmNews wmNews, WmNewsDTO dto) {
        //1.拿到前端传递过来的封面集合
        List<String> images = dto.getImages();
        if (WemediaConstants.WM_NEWS_TYPE_AUTO.equals(dto.getType())){
            //需要自动生成封面
            if (contentImages.isEmpty()){  //如果没有内容图片 设置为无封面
                wmNews.setType(WemediaConstants.WM_NEWS_NONE_IMAGE);
            }else if (contentImages.size() >0 && contentImages.size()<=2){ //设置单图
                wmNews.setType(WemediaConstants.WM_NEWS_SINGLE_IMAGE);
                images=contentImages.stream().limit(1).collect(Collectors.toList());
            }else {
                wmNews.setType(WemediaConstants.WM_NEWS_MANY_IMAGE); //设置多图
                images=contentImages.stream().limit(3).collect(Collectors.toList());
            }
            if (!CollectionUtils.isEmpty(images)){
                wmNews.setImages(imagesToString(images));
            }
            updateById(wmNews);//更新wmNews 中 图片类型 及封面
        }
        if (!CollectionUtils.isEmpty(images)){
            //如果封面不是自动生成 那么获取的是前端传过来的封面集合 是有前缀的 需要替换一下
            images  = images.stream().map(url ->url.replace(webSite,"")).distinct().collect(Collectors.toList());
            saveRelativeInfo(images,wmNews.getId(),WemediaConstants.WM_CONTENT_REFERENCE);
        }


    }

    @Autowired
    WmMaterialMapper wmMaterialMapper;
    /**
     * 保存文章和素材的关联关系
     * @param urls   素材的路径集合
     * @param newsId  文章id
     * @param type  引用类型
     */
    private void saveRelativeInfo(List<String> urls, Integer newsId, Short type) {
       //得到素材id集合
        List<Integer> ids = wmMaterialMapper.selectRelationsIds(urls, WmThreadLocalUtils.getUser().getId());
        //判断素材id数量是否小于素材路径数量，如果小于说明素材缺失，直接抛出异常
        if (CollectionUtils.isEmpty(ids) || ids.size() < urls.size()){
            CustException.cust(AppHttpCodeEnum.DATA_NOT_EXIST,"相关素材不存在，发表文章失败");
        }
        // 保存素材和文章关联关系
        //  insert into 表 values (1,2,3,4), (1,2,3,4),(1,2,3,4),(1,2,3,4)，(1,2,3,4)，(1,2,3,4)
        wmNewsMaterialMapper.saveRelations(ids,newsId,type);

    }


    /**
     * String = [ {"type":"text",value:文本},{type:image,value:前缀+url路径} ]
     * List<Map>
     * @param content
     * @return
     */
    private List<String> parseContentImages(String content) {
        List<Map> contentMap = JSONArray.parseArray(content, Map.class);
        return   contentMap.stream() // 创建流
           .filter(map -> WemediaConstants.WM_NEWS_TYPE_IMAGE.equals(map.get("type")))//找到type为image的数据
           .map(o -> (String)o.get("value")) //得到每个type为image中的value 值： 图片url路径
           .map(url -> url.replaceAll(webSite,"")) //替换前缀路径
            .distinct() //去除重复
           .collect(Collectors.toList());


    }

    private void saveOrUpdateNews(WmNews wmNews) {
        wmNews.setEnable(WemediaConstants.WM_NEWS_UP);//上下架
        wmNews.setCreatedTime(new Date());
        wmNews.setSubmitedTime(new Date());
        if (wmNews.getId()==null){
            //保存
            save(wmNews);
        }else {
            //删除文章和素材的关联关系
            wmNewsMaterialMapper.delete(Wrappers.<WmNewsMaterial>lambdaQuery().eq(WmNewsMaterial::getId,wmNews.getId()));
            //修改
            updateById(wmNews);
        }
    }

    /**
     * [url1,url2,url3]   ===>  "url1,url2,url3"
     * @param images
     * @return
     */

    private String imagesToString(List<String> images) {
       return images.stream()
                .map(url -> url.replace(webSite,""))
                .collect(Collectors.joining(","));

    }


}
